Large swathes of woodland in southern Europe are on fire as the region struggles with one of the worst droughts for decades.In the north west of Spain, firefighters are struggling to control a blaze which has already destroyed some 4,000 hectares. In Pombriego fires have been raging since Wednesday. In the south, 29 children and nine teachers were evacuated from a holiday camp. In Portugal, fires are continuing to burn, with four deemed out of control. Police suspect many have been started deliberately and have arrested more than 70 people. Blazes have destroyed more than 68,000 hectares this year, more than half of them last month. Dozens of people have been evacuated from remote villages in the north. And in France, two new fires are on the march although a blaze near the city of Aix en Provence is now in check. Firefighters are using a new type of water-dropping plane but the main fleet remains grounded after a fatal accident last week over Corsica. A campsite near the foothills of the southern Alps has been evacuated and some 100 people have also been forced from their homes.